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A Superconducting Bolometer Antenna-Coupled toTerahertz Waves

A Superconducting Bolometer Antenna-Coupled toTerahertz Waves The electrical performances and the optical response of a superconducting hotspot air-bridge bolometer (SHAB) coupled through a planar antenna to Terahertz waves and operating in vacuum at about 4.2 K, have been measured. The SHAB consists of a narrow Nb air bridge, voltage biased to form, in the middle of the suspended Nb stripe, a resistive hotspot, whose volume is modulated by the incoming radiation. The signal resulting from the coupled optical power and the device noise performance have been measured by using a home made transimpedance amplifier operating at room temperature, resulting in an electrical NEP of about 40 fW/Hz1/2. Passive detection of the 300 K blackbody radiation at frequency lower than 1.6 THz, band limited by a low-pass optical filters, has been successfully carried out by using a SHAB. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Low Temperature Physics Springer Journals

A Superconducting Bolometer Antenna-Coupled toTerahertz Waves

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References (12)

Publisher
Springer Journals
Copyright
Copyright © 2009 by Springer Science+Business Media, LLC
Subject
Physics; Condensed Matter Physics; Characterization and Evaluation of Materials; Magnetism, Magnetic Materials
ISSN
0022-2291
eISSN
1573-7357
DOI
10.1007/s10909-009-9860-8
Publisher site
See Article on Publisher Site

Abstract

The electrical performances and the optical response of a superconducting hotspot air-bridge bolometer (SHAB) coupled through a planar antenna to Terahertz waves and operating in vacuum at about 4.2 K, have been measured. The SHAB consists of a narrow Nb air bridge, voltage biased to form, in the middle of the suspended Nb stripe, a resistive hotspot, whose volume is modulated by the incoming radiation. The signal resulting from the coupled optical power and the device noise performance have been measured by using a home made transimpedance amplifier operating at room temperature, resulting in an electrical NEP of about 40 fW/Hz1/2. Passive detection of the 300 K blackbody radiation at frequency lower than 1.6 THz, band limited by a low-pass optical filters, has been successfully carried out by using a SHAB.

Journal

Journal of Low Temperature Physics – Springer Journals

Published: Jan 14, 2009

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